<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>自定义js框架</title>
    <script src="js/itcast.js"></script>
</head>
<body>
<button id="clickme">点我吧</button>
<div id="apple"></div>

<script>
    var str = "123";
    $("#clickme").click(function () {
        $("#apple").html(str);
    });
</script>



</body>
</html>
